Anagotus stephenensis, commonly known as the ngaio weevil, is a large flightless weevil that is only found on Stephens Island, New Zealand. The ngaio weevil was discovered in 1916 on Stephens Island and is a relict population. The ngaio weevil has a historic range as far away as South Canterbury and was once common, having been found in reasonable numbers (39) in cave deposits produced by the extinct laughing owl. Intensive searches in 1971 and 1995 saw one or two specimens indicating it had become rarer than when discovered in 1916, when 15 specimens were collected from Stephens Island.